Revert "Update JSROOT version"

This reverts commit 31638823

.gitlab-ci.yml

@@ -7,7 +7,7 @@ pages:
   rules:
     - if: '$CI_SERVER_HOST == "gitlab.phy.anl.gov" && $CI_COMMIT_BRANCH == "master"' 
   script:
-    - git clone -b 6.2.0 https://github.com/root-project/jsroot.git public
+    - git clone -b 6.1.0 https://github.com/root-project/jsroot.git public
     - cp .htaccess public/.
     - cp -r macros public/.
     - cd public && ln -s index.htm index.html && cd ..